A Critical Review of Terminology for Immature Stages in Acanthocephalan Life Histories

Hj, Van Cleave

doi:10.2307/3273533

Cited by 13 publications

(2 citation statements)

References 3 publications

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“…The successive recruitment of arthropods and gnathostomes/vertebrates as acanthocephalan hosts is in line with principal considerations regarding the evolution of increasingly complex life-cycles, whereupon vertebrates fed on potentially infected arthropods after one-host life cycles were established [81]. Moreover, this scenario implies that the indirect development of acanthocephalans, involving the metamorphosis from a larval stage (acanthor) to a young adult (acanthella; called cystacanth when encysted) within the intermediate host [82], represents an evolutionary novelty of acanthocephalans. It is obvious that morphological traits such as the rostellar apparatus of the acanthor, a proboscis including hooks and specific musculature of infectious acanthella and adults, and a reduced digestive tract throughout all developmental stages are acanthocephalan autapomorphies that most probably evolved in the context of their endoparasitic lifestyle [18], [22], [50], [79], [83] (Fig.…”

Section: Discussionmentioning

confidence: 91%

Transcriptome Data Reveal Syndermatan Relationships and Suggest the Evolution of Endoparasitism in Acanthocephala via an Epizoic Stage

et al. 2014

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The taxon Syndermata comprises the biologically interesting wheel animals (“Rotifera”: Bdelloidea + Monogononta + Seisonidea) and thorny-headed worms (Acanthocephala), and is central for testing superordinate phylogenetic hypotheses (Platyzoa, Gnathifera) in the metazoan tree of life. Recent analyses of syndermatan phylogeny suggested paraphyly of Eurotatoria (free-living bdelloids and monogononts) with respect to endoparasitic acanthocephalans. Data of epizoic seisonids, however, were absent, which may have affected the branching order within the syndermatan clade. Moreover, the position of Seisonidea within Syndermata should help in understanding the evolution of acanthocephalan endoparasitism. Here, we report the first phylogenomic analysis that includes all four higher-ranked groups of Syndermata. The analyzed data sets comprise new transcriptome data for Seison spec. (Seisonidea), Brachionus manjavacas (Monogononta), Adineta vaga (Bdelloidea), and Paratenuisentis ambiguus (Acanthocephala). Maximum likelihood and Bayesian trees for a total of 19 metazoan species were reconstructed from up to 410 functionally diverse proteins. The results unanimously place Monogononta basally within Syndermata, and Bdelloidea appear as the sister group to a clade comprising epizoic Seisonidea and endoparasitic Acanthocephala. Our results support monophyly of Syndermata, Hemirotifera (Bdelloidea + Seisonidea + Acanthocephala), and Pararotatoria (Seisonidea + Acanthocephala), rejecting monophyly of traditional Rotifera and Eurotatoria. This serves as an indication that early acanthocephalans lived epizoically or as ectoparasites on arthropods, before their complex lifecycle with arthropod intermediate and vertebrate definite hosts evolved.

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Section: Discussionmentioning

confidence: 91%

Transcriptome Data Reveal Syndermatan Relationships and Suggest the Evolution of Endoparasitism in Acanthocephala via an Epizoic Stage

et al. 2014

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“…Two to four shrimps were autopsied daily but only those with 1-3 larvae of the parasite were used for development studies even though in the field up to 5 cystacanths have been found in a shrimp. The worms were measured and studied as far as possible in saline mounts before being fixed in alcohol-formol-acetic (Van Cleave, 1953) for later critical study. Late larvae were left in tap water to stretch by osmotic effects before measurement and fixation.…”

Section: Intermediate Hostmentioning

confidence: 99%

The Development and Life History of Echinorhynchus truttae Schrank, 1788 (Acanthocephala)

Awachie

1966

J. Helminthol.

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The details of the post-embryonic development of Echinorhynchus truttae in the intermediate host, Gammarus pulex, and the final host, Salmo truttae, are described.The cystacanths of this species are sexually mature and are formed about 82 days after infection at room temperature, ca. 17°C.Copulation takes place in the definitive host soon after the worms enter the pyloric region of the intestine. About 10 weeks after infection, mature eggs are passed out with the faeces of fish.

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Nature and Classification of Parasitic Helminths

Gibson

2010

Topley &Amp; Wilson's Microbiology and Microbial Infections

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A Critical Review of Terminology for Immature Stages in Acanthocephalan Life Histories

Cited by 13 publications

References 3 publications

Transcriptome Data Reveal Syndermatan Relationships and Suggest the Evolution of Endoparasitism in Acanthocephala via an Epizoic Stage

Transcriptome Data Reveal Syndermatan Relationships and Suggest the Evolution of Endoparasitism in Acanthocephala via an Epizoic Stage

The Development and Life History of Echinorhynchus truttae Schrank, 1788 (Acanthocephala)

Nature and Classification of Parasitic Helminths

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